I have a set of RX12's (actually RX, this is last year's graphic, now called the RX12 to avoid confusion, same ski) in 176cm from Kastle. These were extras, and I was going to ski them, but have too many skis. They include the Kti alloy plate and the K12 bindings. New, never skied. It is this ski: http://www.kaestle-ski.com/en/product-line/hardgoods/ski/kaestle-rx12/#/overview It looks like exactly this ski: only the catalogue name has changed.
$765 is a hell of a price on these; that is 1/2 of retail, and they are hard to get. This is "frontside/carver ski of the year" over at Realskiers. If you want the best race carver and front side cruise missile around, and also a ski that can tackle some bumps and off-piste adventures in ways that few race carvers can, then this is your ski.